Dr. X is a midcard rudo for CMLL. He's easily distinguishable by the big X across all of his masks. He's a member of Pandilla Guerrera, and has had notable feuds with Tigre Blanco and La Mascara to start and end his National Welterweight Title reign, though the middle wasn't much to write about (one known defense over 2 years.) His recent National Trios Title reign with Nitro and Sangre Azteca was more active, establishing them as a strong trio.
Like most of his group mates, Dr. X is a solid midcarder who been in that role for quite some time and appears as if he'll be there for quite some time longer. Previous to his Pandilla membership, there were hints of a team up or a feud with fellow doctor Dr. Wagner Jr., but nothing ever came of it.
Dr. X was previously known as Dr. O'Borman Jr.. He rented the name from the original Dr. O'Borman, and opted to change to a unique name rather than continuing to pay the fee. An unrelated wrestler has been using the Dr. O'Borman Jr. of late.